Russian pipe maker United Metallurgical Company OMK pipes f for the construction of main gas pipelines with an increased level of pressure in areas of increased seismic activity and permafrost have successfully passed pneumatic tests by Gazprom Transgaz Yekaterinburg at an experimental site in the Chelyabinsk Region in Russia. The new products were developed by specialists from the OMK Engineering and Technology Center together with Gazprom VNIIGAZ. An experimental batch was made at the OMK Vyksa plant in the Nizhny Novgorod region from its own rolled products from K65 steel. OMK pipes are capable of withstanding gas pressures up to 150 atmospheres (standard pipes are designed for pressures up to 120 atmospheres). At the same time, due to the special composition of steel, they have increased deformation resistance, which allows them to maintain integrity during subsidence or swelling of the base. The pipes are designed for operation in areas with unstable soils and seismically hazardous areas.At the Kopeysk test site, OMK products have successfully passed testing for resistance to avalanche failure, in which the rupture of one pipe leads to the failure of an extended section of the gas pipeline. For the experiment, OMK supplied pipes with a diameter of 1420 mm and a wall thickness of 27.6 mm. They were welded into a 200-meter lash, imitating a real gas pipeline. The ends were closed with power plugs, and air was pumped inside under a pressure of 150 atmospheres and a set of equipment was installed to control pressure, temperature and a number of other parameters. An initiator coil with a shaped charge was placed in the center of the whip to create an initiating crack (compressed air is the main factor causing the destruction of the pipeline).The tests were successful, fully confirming the high quality of Vyksa pipes and their compliance with the stated requirements.